In his first-ever interview, the sole Australian survivor of the Waco siege has revealed to 60 Minutes what really took place during the 51-day stand-off, and why he believes crazed cult leader David Koresh will one day return to Earth as the son of God.

Aust should look at NZ Manus offer:Shorten

Opposition Leader Bill Shorten has reversed Labor's previous stance on New Zealand's offer to resettle 150 refugees from Manus Island and urged the Turnbull government to consider the idea.

Prime Minister Malcolm Turnbull is due to meet the New Zealand leader Jacinda Ardern in Sydney on Sunday.

She's expressed concerns about the Manus Island stand-off in which 600 refugees have barricaded themselves in the mothballed detention centre which closed on Tuesday.

Food and drinking water has run out and the group is too scared to move to alternative accommodation in the main township out of fear they'll be attacked by locals.

But the Immigration Department insists those barricading themselves in the old detention centre have access to food, drinking water and health services at the alternative accommodation facilities.

"We appeal to PNG-determined refugees and failed asylum seekers to move to these locations and to access the services and supports that the PNG government has provided," a spokesman said in a statement.

New Zealand, which takes a total of 750 refugees a year, made an initial resettlement offer under John Key's government in 2013 to the then Labor Gillard government.